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International paper size, also known as ISO (Internateral standards Organisation) sizes are widely used in metric countries. ISO standards are based on a rectangle whose sides have a ratio of one to the square root of 2 (1.414). No matter how many times a sheet of these production. There are three ISO series , designated A, B, and C. |
The A Series
The A Series is for general printed matter including stationery and publications. The basic standard sheet, AO measures 841 x 1189 mm which is the equivalent of a square meter in area. Each number after the series inital A indicates a halving of the preceding larger area. Thus A1 is half of AO, A2 is one quarter of AO, and A3 is an eighth of the AO sheet area, etc. |
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The B Series
The B series is about half way between two A sizes. It is intended as an alternative to the A series, used primarily for posters, wall charts and similar pieces where the different in size of the larger sheets in the A series represents too large a jump. The basic B size, call BO, measures 1000 x 1414 mm. |
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The C Series
The C Series is used for folder, post cards, and envelopes. The C Series of envelope sizes is suitable for insertion of A series sizes either flat or folder: A C6 envelope will take an A6 sheet flat, an A5 folded once, or an A4 sheet folder twice. |
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